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engine rpm problem


 
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critter
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Joined: 23 Jan 2006
Location: canada

PostPosted: Mon Jan 23, 2006 7:06 pm    Post subject: engine rpm problem Reply with quote

i just rebuilt a 1993 4.0 in my 1990 yj, ever since the rebuild, when the engine is cold it runs great, all the rpm and power it can handle, once it warms up the engine spits and sputters when it reaches 3500 rpm. i didn't put any performance parts in it. 5 speed manual, no a/c, replaced coolant sensor,oil pres. sending unit,temp sending unit, spark plugs, waterpump. dealer scanned -no codes and no idea what is causing it. please any help would be appreciated
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critter
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Joined: 23 Jan 2006
Location: canada

PostPosted: Sun Feb 12, 2006 9:02 pm    Post subject: Reply with quote

thanks for all that help people, if anyone'sinterested, it was the crank sensor, running perfect again
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